00904nam0-22003131i-450-9900011101404033210-521-39783-9000111014FED01000111014(Aleph)000111014FED0100011101420000920d1990----km-y0itay50------baengTwistors in Mathematics and PhysicsEdited by T.N. Bailey and R.J. BastonCambridgeCambridge University Press1990London Mathematical Society lecture note series156RelativitàGravità530.11Bailey,T. N.53065Baston,Robert J.ITUNINARICAUNIMARCBK99000111014040332123-21418530FI1FI1Twistors in Mathematics and Physics337878UNINAING01